Hot-blast stove



2Sheets-8heet 1 J. M. HARTMAN. Hot-Blast Stove. No. 224,089. Patented Feb. 3, 1880.

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J. M. HARTMAN. Hot-Blast Stove.

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ET ERS, PHOTDLITHOGRAPHER, WASHINGTON n. C.

, UNITED STATES PATENT OFFICE.

JOHN M. HARTMAN, OF PHILADELPHIA, PENNSYLVANIA.

HOT-BLAST STOVE.

SPECIFICATION forming part of Letters Patent No. 224,089, dated February 3, 1880.

Application filed December 26, 1877. i

To all whom it may concern Be it known that I, JOHN M. HARTMAN, of Philadelphia, Pennsylvania, have invented a new and useful Improvement in Regenerative.

' Fig. 4 is a vertical section through the regenair.

erator and gas inlets and outlets on line 00 y. Fig. 5 is a section through the surging dustvalve.

My invention consists, first, in means for preventing the deposit of dust upon the brickwork of theregenerator,thereby giving greater effect to the heating-surface.

The gas from blast-furnaces contains a great amount of silica, alumina, and lime, which deposits on the fire-brick of the regenerator, and this, being a poor conductor of heat, prevents the heating up of the stove, and also the radiation from the fire-brick when heating up the I wash the gas and extract all the dust possible. In this condition it has a much higher calorific power.

, A is the wrought-iron casing of the regenerator; B, the interior fire-brick walls of the regenerator; b, an air-space between the circular fire-brick wall I) and the shell A; W, projecting fire-bricks to preserve the distance between the fire-brick Wall 11 and shell A. 0 is the gas-purifier, (shown in section, Fig. 3.) It consists, mainly, of an interior pipe, 0, and an exterior pipe, 0

The gas from the furnace enters at the top of the pipe 0, and, passing downward, is deflected by the diagonal plate 0 into the annular space 0 where the heavier particles of dust are deposited upon the ring 0 and from which they are removed through the dust-door 0 The gas then re-enters the flue c, and, passing downward, encounters a jet of water, 0', which causes more of the dust to be deposited in the water at the bottom.

The water in the bottom of the pipe acts as a seal upon the pipe 0, and causes all the gas to pass through the water. This water is constantly renewed, and passes ofi by the overflow-pipe c Where the gas is passed to the regenerator by underground fiues they become quickly choked up with dust. In my improved stove the gas passes by the overhead flue D, which has dust-doors d below, through inlet-valve H, to the stove A. The same arrangement of overhead flue is carried out at Don the chim ney side of the regenerator. The object and use of this, it will be seen, is, first, to prevent as much as possible any dust from passing into the stove, and also to obviate any stoppage of furnace operations while emptying the flues.

A device for discharging the dust from the regenerator is shown in Fig. 5. This consists of a casting, E, in which is fitted a valve, 0, (seen in detail, Fig. 5.) This valve has on its stem a piston, e fitting in a tight cylinder, 6 In the lid of this cylinder are screwed two valves, 6 6 one communicating with the coldblast main,and the other opening tohthe external air. The dust-outlet c is below.

As long as the pressure of the blast or steam is upon the piston e the valve remains closed.

As soon as it is shut off and the valve 6 opened to the atmosphere the valve opens quickly, discharging the dust accumulated at the bottom of the regenerator. This is repeated several times with a surging effect, as

in washing out sediment by the sudden discharge of water. 1

By this construction of valve I am enabled with one man to open and close it suddenly against a pressure of several hundred pounds. By the combination of these various devices with a hot-blast regenerative stove I avoid the frequent stopping of the furnace to clean the regenerator, and the heating-surface of stove, the gas-Washing apparatus 0, consisting of the interior and exterior pipes, 0 0 deflecting-plate c shelf a. jet 0 and the Waterseal at the bottom, substantially as herein described.

2. Combined with a hot-blast regenerative stove, a dust-catching device consisting of the 4. The combination, with a hot-blast regenerative stove, of the valve-casing E, containing the surging dust-valve 0, provided with the piston 0 operated by pressure, substantially as herein described.

5. A regenerative hot-blast stove, combined With a gas-flue leading therefrom and running overhead, the said flue being provided with a sliding valve inserted in its lower part and dust-doors in the under side of its overhead portion, substantially as set forth.

JOHN M. HARTMAN.

Witnesses D. LoUIs SHIVERS, SAML. URICH. 

